title: Amplitude modulation of alpha-band rhythm caused by mimic collision: MEG study.
abstract: Detection of a collision risk and avoiding the collision are important for survival. We have been investigating neural responses when humans anticipate a collision or intend to take evasive action by applying collision-simulating images in a predictable manner. Collision-simulating images and control images were presented in random order to 9 healthy male volunteers. A cue signal was also given visually two seconds before each stimulus to enable each participant to anticipate the upcoming stimulus. Magnetoencephalograms (MEG) were recorded with a 76-ch helmet system. The amplitude of alpha band (8-13 Hz) rhythm when anticipating the upcoming collision-simulating image was significantly smaller than that when anticipating control images even just after the cue signal. This result demonstrates that anticipating a negative (dangerous) event induced event-related desynchronization (ERD) of alpha band activity, probably caused by attention. The results suggest the feasibility of detecting endogenous brain activities by monitoring alpha band rhythm and its possible applications to engineering systems, such as an automatic collision evasion system for automobiles.
authors.forename: Koichi
authors.initials: K
authors.lastname: Yokosawa
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Watanabe
authors.forename: Daichi
authors.initials: D
authors.lastname: Kikuzawa
authors.forename: Gakuto
authors.initials: G
authors.lastname: Aoyama
authors.forename: Makoto
authors.initials: M
authors.lastname: Takahashi
authors.forename: Shinya
authors.initials: S
authors.lastname: Kuriki
mesh_terms: D000063:Accidents, Traffic; D000328:Adult; D000513:Alpha Rhythm; D001288:Attention / Q000502:physiology; D001334:Automobile Driving; D001336:Automobiles; D001921:Brain / Q000502:physiology*; D001931:Brain Mapping; D003344:Cortical Synchronization; D064368:Healthy Volunteers; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D055815:Young Adult